No don't have to do Anything, just download the Win Version , if the Installation ASK wether you want commercial or Evaluation just , Evaluation, because commercial you can't Export you work. So install and Enjoy
Cheers

There is already a Windows Version and Linux One on their Website. Wich One i prefer ? I think i have ho Mention something , of course i'll still use Realflow in Some Situation , Small scale SIM. Example of Large Fluid , Rf, use hybrido , it's easier, at the Same Time it's slower and Even difficult ...

I didn't compare it to Realflow , because i think naiad is more flexible and perhaps more accurate when you deal with Large scale Simulation , the Power of the Node let you create Realy Realistic Flood , Ocean , waterfall etc... And in a very fast SIM Time because of the Tile System .
Cherrs